fbdev: omapfb: remove redundant variable checksum

Variable checksum is being used to accumulate values however
it is never read or used afterwards. It is redundant and can
be removed.

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Helge Deller <[e-mail]>

drivers/video/fbdev/omap2/omapfb/dss/hdmi5_core.c

···
 {
 	void __iomem *base = core->base;
 	u8 cur_addr;
-	char checksum = 0;
 	const int retries = 1000;
 	u8 seg_ptr = ext / 2;
 	u8 edidbase = ((ext % 2) * 0x80);
···
 		}
 
 		pedid[cur_addr] = REG_GET(base, HDMI_CORE_I2CM_DATAI, 7, 0);
-		checksum += pedid[cur_addr];
 	}
 
 	return 0;